Efficient injection of an intense positron beam into a dipole magnetic field
We have demonstrated efficient injection and trapping of a cold positron beam in a dipole magnetic field configuration. The intense 5 eV positron beam was provided by the NEutron induced POsitron source MUniCh facility at the Heinz Maier-Leibnitz Zentrum, and transported into the confinement region...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2015-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/17/10/103038 |
| _version_ | 1827873852716220416 |
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| author | H Saitoh J Stanja E V Stenson U Hergenhahn H Niemann T Sunn Pedersen M R Stoneking C Piochacz C Hugenschmidt |
| author_facet | H Saitoh J Stanja E V Stenson U Hergenhahn H Niemann T Sunn Pedersen M R Stoneking C Piochacz C Hugenschmidt |
| author_sort | H Saitoh |
| collection | DOAJ |
| description | We have demonstrated efficient injection and trapping of a cold positron beam in a dipole magnetic field configuration. The intense 5 eV positron beam was provided by the NEutron induced POsitron source MUniCh facility at the Heinz Maier-Leibnitz Zentrum, and transported into the confinement region of the dipole field trap generated by a supported, permanent magnet with 0.6 T strength at the pole faces. We achieved transport into the region of field lines that do not intersect the outer wall using the ${\bf{E}}\times {\bf{B}}$ drift of the positron beam between a pair of tailored plates that created the electric field. We present evidence that up to 38% of the beam particles are able to reach the intended confinement region and make at least a 180° rotation around the magnet where they annihilate on an insertable target. When the target is removed and the ${\bf{E}}\times {\bf{B}}$ plate voltages are switched off, confinement of a small population persists for on the order of 1 ms. These results lend optimism to our larger aims to apply a magnetic dipole field configuration for trapping of both positrons and electrons in order to test predictions of the unique properties of a pair plasma. |
| first_indexed | 2024-03-12T16:42:57Z |
| format | Article |
| id | doaj.art-db2adb212403420dab8cb700e71d6325 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:42:57Z |
| publishDate | 2015-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-db2adb212403420dab8cb700e71d63252023-08-08T14:22:40ZengIOP PublishingNew Journal of Physics1367-26302015-01-01171010303810.1088/1367-2630/17/10/103038Efficient injection of an intense positron beam into a dipole magnetic fieldH Saitoh0J Stanja1E V Stenson2U Hergenhahn3H Niemann4T Sunn Pedersen5M R Stoneking6C Piochacz7C Hugenschmidt8Max Planck Institute for Plasma Physics , Greifswald and Garching, Germany; The University of Tokyo , Kashiwa, JapanMax Planck Institute for Plasma Physics , Greifswald and Garching, GermanyMax Planck Institute for Plasma Physics , Greifswald and Garching, GermanyMax Planck Institute for Plasma Physics , Greifswald and Garching, GermanyMax Planck Institute for Plasma Physics , Greifswald and Garching, Germany; Ernst-Moritz-Arndt-Universität Greifswald , Greifswald, GermanyMax Planck Institute for Plasma Physics , Greifswald and Garching, Germany; Ernst-Moritz-Arndt-Universität Greifswald , Greifswald, GermanyMax Planck Institute for Plasma Physics , Greifswald and Garching, Germany; Lawrence University , Appleton, USATechnische Universität München , Garching, GermanyTechnische Universität München , Garching, GermanyWe have demonstrated efficient injection and trapping of a cold positron beam in a dipole magnetic field configuration. The intense 5 eV positron beam was provided by the NEutron induced POsitron source MUniCh facility at the Heinz Maier-Leibnitz Zentrum, and transported into the confinement region of the dipole field trap generated by a supported, permanent magnet with 0.6 T strength at the pole faces. We achieved transport into the region of field lines that do not intersect the outer wall using the ${\bf{E}}\times {\bf{B}}$ drift of the positron beam between a pair of tailored plates that created the electric field. We present evidence that up to 38% of the beam particles are able to reach the intended confinement region and make at least a 180° rotation around the magnet where they annihilate on an insertable target. When the target is removed and the ${\bf{E}}\times {\bf{B}}$ plate voltages are switched off, confinement of a small population persists for on the order of 1 ms. These results lend optimism to our larger aims to apply a magnetic dipole field configuration for trapping of both positrons and electrons in order to test predictions of the unique properties of a pair plasma.https://doi.org/10.1088/1367-2630/17/10/103038antimatter plasmaelectron–positron plasmapair plasmapositron beamdipole magnetic field |
| spellingShingle | H Saitoh J Stanja E V Stenson U Hergenhahn H Niemann T Sunn Pedersen M R Stoneking C Piochacz C Hugenschmidt Efficient injection of an intense positron beam into a dipole magnetic field New Journal of Physics antimatter plasma electron–positron plasma pair plasma positron beam dipole magnetic field |
| title | Efficient injection of an intense positron beam into a dipole magnetic field |
| title_full | Efficient injection of an intense positron beam into a dipole magnetic field |
| title_fullStr | Efficient injection of an intense positron beam into a dipole magnetic field |
| title_full_unstemmed | Efficient injection of an intense positron beam into a dipole magnetic field |
| title_short | Efficient injection of an intense positron beam into a dipole magnetic field |
| title_sort | efficient injection of an intense positron beam into a dipole magnetic field |
| topic | antimatter plasma electron–positron plasma pair plasma positron beam dipole magnetic field |
| url | https://doi.org/10.1088/1367-2630/17/10/103038 |
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